Anyone else get one the week after a big deadline instead of during it?

I can white knuckle through the stressful part just fine, then the day I finally relax my lip starts tingling like clockwork. It happened again this weekend after I handed in a project I had been grinding on for a month. I feel like my body waits for permission to fall apart. Is this a thing for other people, and has anyone figured out how to prep for the crash instead of the crunch?